this alarm clock be the perfect backup travel alarm clock . it be the smallest , lightest alarm clock possible that even have a few extra feature to boot . \* it be small 2.6 '' W x 1.8 '' h x 0.6 '' d and weigh a scant 2oz with battery . \* it take 2 lr44 watch battery -lrb- easy to find -rrb- that have a lifespan of over 1.5 year and be lighter than the newer version -lrb- Casio PQ-13 and Casio PQ-15 -rrb- that take aaa and aa battery . \* Extra feature on this tiny clock be : 1 -rrb- 12 & 24 hr setting 2 -rrb- snooze feature -lrb- only 5-mins though -rrb- 3 -rrb- lead backlight -lrb- old green type -rrb- 4 -rrb- 3 separate function button that adjust with a audible click : time -lrb- alarm\/clock\/display -rrb- , display -lrb- 12 or 24 hour -rrb- , and alarm -lrb- on\/off\/snooze -rrb- so that there be not any mistake . as a result of its compact size , the function button be tiny . however , after a few use one can easily remember which button be which . in addition , as this be digital , there be no annoying tick . my main complaint be that the snooze\/light button -lrb- the blue one be the picture -rrb- be not protect when the stand\/cover be close . as such , the button could get accidentally press during transport . however , this issue have not be address in subsequent version . highly recommend as a backup travel alarm for those of we with smart phone . if the small label and tiny button be not a issue , this would also work well as a primary alarm clock .